/*
 * Copyright (C) 2008-2012 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2011 MaNGOS <http://getmangos.com/>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "SHA1.h"

#ifndef _WARDEN_KEY_GENERATION_H
#define _WARDEN_KEY_GENERATION_H

class SHA1Randx {
public:
    SHA1Randx(uint8 *buff, uint32 size) {
        uint32 taken = size/2;

        sh.Initialize();
        sh.UpdateData(buff,taken);
        sh.Finalize();

        memcpy(o1,sh.GetDigest(),20);

        sh.Initialize();
        sh.UpdateData(buff+taken,size-taken);
        sh.Finalize();

        memcpy(o2,sh.GetDigest(),20);

        memset(o0,0x00,20);

        fillUp();
    }

    void generate(uint8 *buf, uint32 sz) {
        for(uint32 i=0;i<sz;i++) {
            if(taken == 20) {
                fillUp();
            }

            buf[i] = o0[taken];
            taken++;
        }
    }
private:
    void fillUp() {
        sh.Initialize();
        sh.UpdateData(o1,20);
        sh.UpdateData(o0,20);
        sh.UpdateData(o2,20);
        sh.Finalize();

        memcpy(o0,sh.GetDigest(),20);

        taken = 0;
    }
    SHA1Hash sh;
    uint32 taken;
    uint8 o0[20],o1[20],o2[20];
};

#endif
